Aiming at the problem that the vertical scour shear effect of drag head high-pressure water of trailing suction hopper dredger(TSHD) is not obvious,we design and modify the high-pressure water jet nozzle of drag head,put forward a method that adopt installation of high-pressure jet nozzle of oblique flush type inside the trapezoidal wear-resistant block to increase the shear failure of soil by high-pressure water,and analyze the improvement effect of before and after.The results show that when the jet pressure is large enough,the method can effectively shear the mud surface to achieve the effect of the clods to break away from the mud layer,and improve the construction efficiency.The method can provide references for similar projects.